The explosion killed at least 135 people, injured 5,000 and pushed up to 250,000 out of their homes after the shockwaves ripped out doors and shattered windows miles inland.
The death toll is expected to rise. Officials blamed the blast on a huge stockpile of highly explosive material stored for years in unsafe conditions at the port.
For many Lebanese, it was the latest blow they blamed on a clutch of sectarian political elites that have ruled for decades.
The government has vowed to hold those responsible for the explosion to account.